Todd Lipcon created HDFS-4828:
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Summary: Make QJM epoch-related errors more understandable
Key: HDFS-4828
URL: https://issues.apache.org/jira/browse/HDFS-4828
Project: Hadoop HDFS
Issue Type: Improvement
Components: qjm
Affects Versions: 3.0.0, 2.0.5-beta
Reporter: Todd Lipcon
Since we started running QJM on production clusters, we've found that users are
very confused by some of the error messages that it produces. For example, when
a failover occurs and an old NN gets fenced out, it sees errors about its epoch
being out of date. We should amend these errors to add text like "This is
likely because another NameNode took over as Active." Potentially we can even
include the other NN's hostname, timestamp it became active, etc.
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